Patent GB-191409377-A (GB)
Title: Improvements in or relating to Duplicating Machines.
Inventor: LIEBENTHAL HERMAN GUSTAVE
IPC: B41L15/06
Filed: 1914-04-15
Granted: 1915-03-11
Abstract: 9377. Liebenthal, R. G. April 21, 1913, [Convention date]. Rotary machines; cylinder machines; tripping-arrangements.-A duplicator comprising a rotary printing-drum, provided with undercut channels to receive flanged type for printing through an ink ribbon against an impression roller covered with resilient material, is adapted to give a uniform impression with type-lines of varying length by inserting filling or distance pieces in the type-grooves which are not filled; or such pieces may be arranged in recesses formed in the drum, or in a band secured thereto, beyond the end of the impression cylinder, and act against bearer disks on the shaft of the impression roll which may be eccentrically mounted for pressure adjustment. The drum 106, Fig. 1, is secured to end disks on the driving-shaft 105, and one disk is toothed to drive a pinion 131 loose on the shaft 117 of the impression roll 118, but arranged to drive that roll, which is loosely mounted on an eccentric part of the shaft, through a bearer disk 121 having lateral lugs loosely engaging recesses in the roll 118 and pinion 131. Another bearer disk 122 similarly engaging the roll 118 is arranged at the other end of the shaft 117, which can be rotated by an arm 137 to adjust the impression pressure, and by means of an eccentric bearing 115 can be brought into parallelism. The distance-pieces 145 may be arranged in the type-grooves in alinement with short lines of type and act against the resilient impression roll, or, as shown in Fig. VI, may be formed from sheet metal 156 and mounted on undercut projections 158 provided on the printing-drum itself or on a ring 152 secured to it, and act against the rigid bearer disks 121, 122. The pieces 145 may be extended to bridge several type-grooves and engage all or only two of the grooves. In a modification, shown in Fig. XI, provision is made for varying and adjusting the distance between the axis of the bearer disks 187, 188 and that of the printing-drum 169, for which purpose the disks are mounted on eccentric sleeves 190, 191 connected by a cross-bar, provided at one end with a slotted quadrant 196 held by a screw 198. In this case, the driven pinion 206 is mounted on a concentric extension of the sleeve 190. The Specification as open to inspection under Section 91 (3) (a) comprises also a construction and arrangement of distance or filling piece having a strip integral therewith or secured thereto and adapted to extend between the ink ribbon and the paper to be printed; or the strips may be secured independently of the filling-piece. As shown in Figs. II and III (Cancelled), strips with flat faces 31, 32, 33 are arranged above the filling-pieces 27 and extend over the ink ribbon, and are so mounted that they are supported by the filling-pieces 27 during impression to prevent these from pressing the ribbon against the paper. The strips are secured in position at one end by means of tips 34 which are engaged by sockets 35 in a band 36, which is secured to one edge of the drum by means of a flexible hook engaging one of the guide-rods for the ink ribbon, the other end being similarly secured or preferably being formed with a rigid hook engaging an undercut abutment secured to the drum by a screw. The other ends of the strips are secured in the typegrooves by flanges 45 which are shaped to engage the grooves, and the attachment is made secure by resilient metal abutments 48 which fit in the grooves. In a modification, in which a printing- drum of greater circumferential extent is employed, the band 36 is secured to the drum at one end by a riveted flexible hook which engages one end of the drum, and a hook is formed with a flange engaging an undercut abutment formed by the end rail of the series of rails forming the type-channels. The strips 31 &c. may be held at both ends by bands, or by means of abutments as 48. As shown in Figs. XV and XVI (Cancelled), applied to a machine in which a rotary cylinder coacts with a reciprocating' impression surface, the filling-pieces 78 have strips 81 secured to them by soldering &c., these strips being preferably covered with a rubber tube 82 under which the ink ribbon is placed. For wider printing-surfaces, the filling-pieces 86, Fig. XVII (Cancelled), are fitted with rubbercovered U-shaped strips 87, which permit the ribbon to overlie the pieces 86. The filling- pieces 86 may be formed without flanges so that they can be inserted radially into the typechannels. The strips 87 may be cast to the blocks. This subject-matter does not appear in the Specification as accepted.